62. Which of the following statements about crossing-over is false? b Crossing o

Question

62. Which of the following statements about crossing-over is false? b Crossing over is solely responsible for "recombinant" phenotypes. c) Crossing-over only occurs in meiosis I, not meiosis II. a) Crossing-over can unlink (separate) linked genes Crossing-over allows homologous chromosomes to travel to the center of the spindle (metaphase plate) together. d) e) None of the above 63. Which of the following statements about meiosis is true Separation of homologous chromosomes occurs during meiosis II. Failure to separate homologous chromosomes during mitosis Il would non-identical daughter cells. The "x"and "y" sex chromosomes in humans do not participate in crossing-over. A single non-disjunction event during meiosis II would lead to two cells that are aneuploid, and two cells with the normal chromosome number There is more than one correct answer choice a) b) lead to c) d) e) 64. Which of the following statements about organelles is false? a) The rough endoplasmic reticulum (RER) can fuse with vesicles coming from the Golgi apparatus. b) The RER can send vesicles to the Golgi apparatus. c) d) e) The RER is the site of the completion of translation of proteins that will function Glycosylation of polypeptides (addition of sugars) only happens in the Golgi apparatus. Many proteins that function in the mitochondria are translated on free ribosomes in the cytoplasm. 65. Which of the following statements about the eukaryotic cell and its chromosomes is false? a) b) c) Vesicles traveling from the RER to the Golgi apparatus move along microtubule tracks The centromeric region of linear chromosomes is the point of attachment of kinetochore proteins. The telomeric region of chromosomes contains no genes The heterochromatin/euchromatin pattern of chromosomes is fixed in a cell and thus cannot change. "May we go home now?? My head hurts!" (Don't choose- and have a wonderful summer breakl) d) e) 18

Explanation / Answer

Ans. #62. Correct option- C. Crossing over only occurs in meiosis I, not in meiosis II.

#63. Correct option- C. The X and Y chromosomes in humans do not participate in crossing over.

#64. Correct option- E. Many protein that function in the mitochondria are translated on free ribosomes in cytoplasm.

#65. Correct option- D. The heterochromatin/euchromatin pattern of chromosomes is fixed in a cell and thus can’t change.   

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